这个是怎么执行的呢，望具体解析O(∩_∩)O~~
<table border="1px">
<?php
for ($c=1;$c<=9;$c++){
echo "<tr>";
for ($d=$c;$d<=9;$d++){
echo "<td align='right'>";
echo $c."x".$d."=".$c*$d." ";
echo "</td>";
}
echo "</tr>";
echo "<tr/><tr/>";
}
?>
</table>
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